Horseshoe.



UNITED STATES,

Patented July 5, 1904.

PATENT O FicE.

MARVIN M. MoOAIN, OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,TO EMPIRE SAFETY TREAD COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OFTHE DISTRICT OF COLUMBIA.

HORSESHQE.

SPECIFICATION forming part: of Letters Patent No. 764,488, dated July 5,1904. Application filed January 15, 1903. Serial No. 139,106 (No model.)

To all whom it may concern.-

Be it known that I, MARVINM. MCCAIN, a citizen of the United States,residingin the city of Brooklyn, county of Kings, and State a part ofthis specification, my inventionis fully illustrated in several figures,with similar letters of reference to indicate'corresponding parts, asfollows:

Figure 1 represents a plan view of my improved horseshoe from thefaceside which rests upon the ground. Fig. 2 represents a transverse sectionof Fig. 1 through the line 2 2. Fig. 3 represents a section on the line5 5, Fig. 1, before the calk is inserted. Fig. 4 represents a section ofthe calk before it is secured in the shoe. Fig. 5represents a section online 5 5, Fig. 1, with calk inserted in its place, showing theintermediate substance which holds the calk in position. Fig. 6represents a front view of the finished shoe looking toward the toe,showing the calk protruding from the socket into which it is secured.Figs. 7 and 8 represent transverse sections to show another method ofsecuring the calk. Fig. 9 represents a view of a complete horseshoe witha continuous stone facing; and Figs. 10 and 11 represent cross-sectionson line 10 10, Fig. 9, with and without the stone filling, all of whichwill be hereinafter explained.

Referring to Fig. 1, a metal horseshoe is formed (usually bydrop-forging) which contains the sockets to receive the calks at. Thesesockets are provided with a raised portion or combing 0, which projectsabove the plane of this shoe the desired height to protect the ca k.

The calk which I use and which is illus trated separately in Fig. 4 ismade of corundum stone, generally formed in molds the (lesired size andshape, or said calk may be formed of any hard porous artificial stone.

From Figs. 2, 3, and 5 it will be seen that the sockets which receivethe calks a are larger at the bottom than on the top, or open, thusforming a dovetail which is utilized to hold the calk in place. fromFigs. 2, 4, and 5 that the calk itself much larger at the bottom than atthe top and that its bevel corresponds to that of the bevel in thesocket which forms the dovetail. Thelargest surface of the calk (whichis its under surface and the one which rests within the dovetail) is thesame size as the opening of thedovetail socket of the shoe into which itis to rest. Therefore when the calk is placed within the socket it willleave a space of equal thickness surrounding the calk within the socket,as shown at (Z, Figs. 1,2, and 5. In some cases it is best to destroythe metallic contact between the calk and the socket of the shoe as faras possible, which can only be done by surrounding the calk on all sideswithin the socket by a vegetable or non-metallic substance, whichsubstance forms a shock-absorbent. One method of accomplishing thisresult where the shoes are light and used for carriage or rapid-gaitedhorses is to place a certain amount of unvulcanized rubber within thesocket underneath the calk suflicient in quantity to fill thesurrounding space and the space between the calk and the bottom of theshoe: A clamp is than used to press on all three calks a, Fig. 1, whichwhen the rubber is hot and very soft will force the calks down and holdthem into the desired position, while the hot rubber will travel in alldirections to fill the intermediate space. Thus the calk when the rubberis vulcanized is left dovetailed securely within the socket by means ofthe intermediate rubber, this rubber being made hard or soft accordingto the duty required of it to hold the calk in position. The principalmethod, however,

which I employ and which is used where the It will also be seen shoesare heavy for service on draft-horses is to suspend the calk in positionwithin the socket, as illustrated in Figs. 2 and 5, leaving a spacebelow and on all sides of the calk, and then fill the intermediate spacewith hot lead or solder or a soft Babbitt metal. hen this is done,however, Iusually have the shoes quite hot, so that the socket isexpanded to its largest size. Thus when the shoe is cooled the socketwill contract on the lead and hold it more firmly.

It is not necessary that the calk should project far above the combing cor socket, as the metal forming the sockets will wear so much fasterthan the corundum stone which forms the calk that the stone calk isalways projecting sufficiently far to perform the service required ofit.

Another method of securing the calk in position is illustrated in Figs.7 and 8. In this case the socket in the shoe which is to receive thecalk has its sides made perfectly straight, as shown in Fig. 7. Thecalk, however, is dovetailed in the usual form and is sufiiciently smallto permit of a piece of rubber or other tough non-metallic substance, as

described, being inserted between the calk and socket. The calk is thenforced into position and the sides of the socket bent over upon thedovetailed portion of the calk, as shown in Fig. 8.

It may be advisable on some occasions to extend the calks entirelyaround the shoe, as shown in Fig. 9, in order to get the greater wearingservice, in which' case the same methods of securing the stone inposition as that above described would be employed, except where it isdesirable to provide a calk that is high and sharp, as shown in Fig. 10.The method then employed is to provide the shoe with sockets which havehigh combings 0, Figs. 10 and 11, tapering to a sharp edge, the socketthus provided being filled with the corundum stone while in its plasticcondition and left to cool and harden, the iron shoe contracting uponthe calk as it cools and providing practically one solid structure. Thecorundum stone thus forming the surface which comes in contact with theground will never slip and will wear for a long period of time.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is

1. A horseshoe the body portion of which is provided with dovetailedsockets, removable dovetailed calks arranged in said sockets andconforming to the shape thereof but of less size than that of thesockets, whereby a space is provided at all points between the calks andthe body of the shoe, and shockabsorbing material enveloping theportions of the calks within the sockets to prevent contact of the calkswith the body of the shoe.

2. A metal horseshoe provided with dovetailed sockets on its wearingside, suitable non-slipping calks formed to fit within the said sockets,leaving a space between the said calk and socket, with a hardeningplastic substance filling the said space to retain the said calk firmlyin position, substantially as set forth.

3. A horseshoe the body portion of which is provided with dovetailedsockets, combings arranged around said sockets and projecting beyond theplane of the shoe, removable dovetailed calks arranged in said socketsand formed of a hard porous substance,the size of said calks being lessthan the size of the sockets, whereby a space is provided at all pointsbetween the calks and the body of the shoe, and a packing arranged insaid space and enveloping the entire portion of the calks within thesockets to provide a shock-absorbent therefor and prevent contact of thecalks with the body of the shoe.

In testimony that I claim the foregoing specification I have hereuntoset my hand this 12th day of January, 1903.

MARVIN M. MCCAIN.

In presence of E. G. DUVALL, G. H. HUNTINGTON.

